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Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,639
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Quick ? for EE's.
I have what appears to be an induction motor on a 12" squirl cage fan that I use for ventilating an enclosed patio during the summer months. Even being a SC fan, it's kinda noisy, so I thought I might throttle it down with a controller. What shoudl I look for beyond a silly dimmer switch? Will a router speed control (for a brush type motor) do the same job? It's not hard wired, so an inline device would be ducky.
TIA |
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06-09-2006, 03:51 PM
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Registered
Join Date: Oct 2002
Location: Tucson, AZ
Posts: 1,599
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Induction motors are AC synchronous motors, which means their RPM is dependent on the power line frequency. There's no easy way to vary their RPM, and a dimmer switch won't work. You can chop the AC voltage somewhat and get a slight RPM reduction, but a little too much it will just stall. If it's belt driven you're best bet is to go to a larger pulley on the squirrel cage, or smaller on the motor shaft. If the cage is directly mounted on the motor shaft then you're SOL.
Last edited by 914GT; 06-09-2006 at 04:28 PM.. |
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06-09-2006, 04:24 PM
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Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,639
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Sorry, forgot to mention it was direct drive.
Anyway, that was the answer I was looking for. I'll mount it further away and use ducting or buy a smaller fan. Last year, I used a thermostat controlled 16" attic fan. That sucker was pretty noisy too being a blade type. I ought to just get a cheap stove hood 
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06-09-2006, 05:39 PM
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